feat: Update Proxmox extension with various improvements and bug fixes

- Change listStates method to accept nullable integer for limit parameter.
- Modify TechnitiumDns class to return structured error messages on failure.
- Enhance VNC and xterm popup routes with user authorization checks.
- Update backups view to improve loading states and add unique keys for dynamic elements.
- Refactor cloud-init view to ensure proper data binding and improve user experience.
- Add wire:key attributes to various elements in views for better Livewire performance.
- Improve error handling and user feedback in the firewall view.
- Update server overview and statistics views to handle potential null values gracefully.
- Add new migration files to extend database schema with user-set icons and notes for Proxmox nodes.

themes/lucentui/views/tickets/widget.blade.php

@@ -25,7 +25,7 @@
         </div>
         <p class="text-base text-sm">
             {{ __('ticket.last_activity') }}
-            {{ $ticket->messages()->orderBy('created_at', 'desc')->first()->created_at->diffForHumans() }}
+            {{ $ticket->messages()->orderBy('created_at', 'desc')->first()?->created_at?->diffForHumans() ?? __('ticket.no_messages') }}
             {{ $ticket->department ? ' - ' . $ticket->department : '' }}
         </p>
         </div>